Thermostat.



No. 782.453. PATENTED FEB. 14, 1905. J. I. LINLER.

THERMOSTAT.

APPLICATION FILED FEB. 13, 1904.

W 177,655 66 [NJ/6771101 Patented February 14, 1905.

PATENT OFFICE.

JOHN I. LINLER, OF AIKEN, SOUTH CAROLINA.

THERMOSTAT.

SPECIFICATION forming part of Letters Patent No. "782,453, dated February 14, 1905.

Application filed February 13, 1904:. Serial No. 193,419.

To all whom it may concern:

Be it known that I, JOHN T. LINLER, a citizen of the United States, residing at Aiken, in the county of Aiken and State of South Carolina, have invented a new and useful Thermostat, of which the following is a specification.

The invention provides a novel thermal circuit-closer for automatically turning in an alarm when the temperature in any locality approaches or exceeds a dangerous point.

The invention relates to the peculiar construction and arrangement of the parts, whereby the device may be cheaply manufactured and is quick to respond and insure closing of the circuit and a sounding of the alarm or operation of the mechanism dependent upon establishing the circuit.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting the result reference is to be had to the following description and drawings hereto attached.

While the essential and characteristic features of the invention are susceptible of modification, still the preferred embodiment of the invention is illustrated in the accompanying drawings, in which Figure 1 is a perspective view of a thermostat embodying the invention, the cover of the case being omitted. Fig. 2 is a View of the device as seen from the rear. Fig. 3 is a side view of the thermostat applied to a wall, the latter beingin section and a portionof the case being broken away. Fig. 4 is a detail view of the fusible restrainer.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The case for inclosing the operating parts is composed of two sections, a base portion (Z and a cover it. The base (i is preferably of circular form and has a rim at its outer edge to which is fitted the rim of the cover /L by means of a slip-joint. The parts (Z and k may be constructed of any material, sheet metal being preferred, and are pressed or stamped into the form substantially as illustrated. The

operating elements are attached to the base and are housed by the case so as to prevent interference therewith by rodents.

Binding-posts and e are attached to the base and are in electrical connection with the circuit-closing elements and with the terminals of the electric circuit, (not shown,) incl uding the alarm or other mechanism to be operated. One of the binding-posts, as e, is electrically insulated from the case. An electric contact a is connected to the base and electrically insulated therefrom and is in electrical connection with the binding-post e by means of the conducting-wire 70. A standard Z projects from the base, and a spring 0 is attached thereto and constitutes the other electric eontact for cooperation with the electric contact afor closing the circuit when a predetermined temperature has been reached. A plate 7) is attached to the spring 0 and is provided near its free end with a sleeve m. The plate 0 is connected to the spring 0 at a point between its ends, and the outer portion of the spring, opposite to the plate I), is spaced therefrom and reduced in width to provide a yielding terminal or tongue portion to insure positive electrical connection being established when the plate 7) is released from the influence holding it in restraint. A standard 02. extends from the base and is provided with a sleeve g.

The standards Z and a are preferably integral parts of the base and are pressed therefrom, as illustrated most clearly in Fig. 1.

The restrainer f is approximately of U form and is constructed of some material that will readily fuse at a comparatively low temperature and may be composed of bismuth or an alloy thereof which will melt at a temperature slightly above the ordinary. By combining ingredients an alloy may be produced which will fuse at any required temperatu re, and this alloy is drawn to form a wire of determinate gage, said wire being cut into lengths and bent at its ends into the form substantially as shown in Fig. 4. hen the fusicircuit under normal conditions. IV hen the temperature in the locality of the thermostat reaches a dangerous point, the restrainer f is fused and the spring 0 no longer being under restraint tends to assume its normal position, which is to bring the contact 0 in engagement with the contact (4, thereby closing the electric circuit and sounding the alarm or operating the mechanism included in the electric circuit designed to be closed by the thermal device.

In buildings and other structures having hollow partitions or walls it is the intention to locate the thermostat in the space of the walls so as to be reached by any excessive heat or flame circulating through the space of the walls, and thereby give warning even though there is no visible sign of fire. In Fig. 8 the part i represents the plastered side of a wall or partition, and an opening 1 is formed therein, and the thermostat is secured to the inner side of said wall opposite to the opening j to be readily afiected by any flame or fire in the room tending to pass through the opening into the space between the walls. Obviously the thermostat may be arranged in any desired position to be safe-guarded from lire so as to effect an alarm when the temperature in the vicinity of the thermostat approaches or exceeds a dangerous point.

Having thus described the invention, what is claimed as new is- 1. In a thermal circuit-closing device, the combination of afixed electric contact, acoopcrating electric spring-contact normally tending to close against the fixed contact, a plate projected from the electric spring-contact and having a sleeve, a standard provided with a sleeve, and a fusible restrainer of approximately U form adapted to have its legs fitted into said sleeves, substantially as described.

2. In a thermal circuit-closing device, the combination of a base having integral standards, one of said standards being provided with a sleeve, an electric spring-contact attached to the other standard, a plate projected from the electric spring-contact and havinga sleeve, a companion electric contact connected to the base, and a fusible restrainer of approximately U form having its legs littedinto the aforesaid sleeve, substantially as set forth.

JOHN J. LINLER.

\Vitnesses:

R. A. BALDunsoN, ALEX. Sco'r'r. 

